Should an agency bring a working prototype to a pitch, not just a deck?

By Kaz Kato · Published 12 October 2026 · Updated 12 October 2026

Yes, when the brief allows it. A working prototype lets the client use your idea instead of imagining it, and it reaches the people who missed the meeting. Keep the deck for strategy, team and price. Bring the prototype for the idea itself, on data like theirs, and send each stakeholder their own link afterwards.

This guide covers why a prototype helps an agency win, and when a deck is still the right thing. Then how much to build, how to send it to a whole panel, and what you learn before they decide. Agencies shows the same loop on one page. How to pitch an idea to a client has the structure, and pitching a website the version for a site.

Three ways into an agency pitch

Approach	What the panel experiences	What travels after the meeting	What you learn before the decision
A deck only	Your story, told	The deck, if they ask for it	Little or nothing
A deck, and a live demo on the day	The idea working, once, with you driving	The deck	What they say in the room
A deck, and a prototype sent as a Roomi room, one link per stakeholder (ours)	The idea working, for each person, as often as they like	The room and its tour, named for each person	Who opened it, who came back, who they brought in, what they asked

We make Roomi, so the last row is ours. It is there because sending the prototype after the meeting is the point of this guide. Sending a demo instead of a deck covers that part on its own.

Why bring a working prototype to a pitch?

Because a panel believes what it has used. A deck asks them to imagine your idea, and a prototype lets them try it on something that looks like their own business. It also outlasts the meeting. The people who missed it can open it later, and you see who did.

• It is the idea, not a description of it. The panel stops judging your slides and starts judging the work.
• It travels. A deck is retold by whoever was in the room. A prototype tells itself, with a guided tour, to whoever opens it.
• It shows you can build. The thing you are pitching already exists, in part, before anyone has signed.

When is a deck still the right thing?

A deck is still right for your credentials, your team, your process, the price and the terms. It is also right when the brief forbids creative work, or when a panel wants paper to score. Bring the deck for those, always. The prototype is for the idea, and it sits beside the deck rather than replacing it.

• Credentials and team. Who you are, and the work you have done before.
• Process and timeline. How you would run the project.
• Price and terms. The figures belong in a document the client can file.
• A brief that forbids work. Respect it. A prototype the brief did not ask for can count against you.
• A panel that scores on paper. Give them the paper, and offer the prototype as well.

How much should you build for a pitch?

Build only the moments that win the brief, on mock data. That is usually the one screen that solves the client’s problem, the result they care about, and the path between them. Leave out logins, settings and everything a real product needs but a pitch does not. A narrow prototype that works beats a wide one that half works.

1. Pick the moment. The screen the panel will talk about after you leave.
2. Fill it with mock data shaped like theirs. Their kind of customer and product, all invented. Use their logo or words only with their permission.
3. Write a short tour. Three to six steps, one idea each, in the order you would pitch it. Writing the tour has the rules.
4. Rehearse it as a viewer. Preview as viewer opens the room exactly as the panel will see it, and records nothing.

How do you send it to the whole panel?

Make a link for each stakeholder, named for them, and send each one yourself. If the client forwards it to someone you never met, that person is asked who they are, and appears under the link they used. Your studio’s name and colour go on the room, and on Team your logo too.

• One link per person. The procurement lead, the marketing director, the founder: each gets their own, so each journey is theirs.
• Forwards are named. Whoever opens a forwarded link is asked “Are you Priya Shah?”, and someone who says no gives their own name.
• Your brand, not ours. Pro carries your name and accent colour. Team themes the whole room as your own, with your logo. Brand and next steps has the detail, and teams covers sharing the work across the studio.
• Tell each person. When you send a link, say who you are, that the room records what they do in it, and how to reach you about that. Roomi’s terms ask you to.

What do you learn before the decision?

You learn which stakeholders used the prototype, which parts held them, who came back and who they brought in, before the panel meets to decide. The room also names who to call first, with the evidence that put them there. So you go into the decision knowing who is for you and what they asked.

What you see	What it tells you
Each stakeholder’s journey	What they opened, in what order, and for how long
How far through the tour they got	Whether the idea held them to the end
Who came back	Who is still thinking about it, an hour or more later
Who they brought in	Who else is part of the decision
Comments pinned to the screen	Their questions, on the screen they were about
Who to call first	The warmest person today, with the evidence in words
Their reactions	A heart, a clap or a fire, by name

Every one of these is a count or an event, never a score. Pricing shows which plan carries each, and buying signals says how to read them.

Questions people ask

Is a prototype for a pitch just free spec work?

Kaz’s view: it is if you build the whole thing. Build only the moments that win the brief, on mock data, and it is a sharper way of showing your thinking. If the brief asks for no creative work, keep to the deck.

Can the client keep using it after the pitch?

Only while their link works. Give each link an expiry when you make it, or revoke it at any time, and it stops opening the room at once.

What if they forward it to a rival agency?

Whoever opens a forwarded link is asked whether they are the person it was made for, and anyone else gives a name. You see them under that link, and you can revoke it.

Can our studio’s brand be on the room?

Yes. Pro puts your name and accent colour on the room. Team themes the whole room as your own, with your logo.

Can we put the credentials deck in the room too?

Yes. Add it as a PDF, and it opens in the room’s own reader beside the prototype. You see which of its pages each person read, and for how long.

About the author

Kaz Kato, Co-founder & CTO, Roomi. Kaz co-founded Roomi with Tesh, whom he has built with since 2017: two startups that failed, one venture studio that didn’t, and an exit.

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